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## Logarithmic Functions

Logarithmic scales are used when the range of possible values is very wide, such as the intensity of an earthquake or the acidity of a liquid, in order to avoid the use of large numbers.

# Level 2

Evaluate the following:

$\Large 9^{\log_{3}(4)}$

Do not use a calculator -- not even a slide rule!

$\large \log_2 3 \times \log_3 4 \times \log_4 5 \times \cdots\times \log_{127} 128 = \, ?$

True or false:

$$\quad \quad$$ $$\log_{x}1=0$$ for every $$x>0$$.

$\large \sum_{\text{cyclic}(a,b,c)} \left( \dfrac1{1 + \log_a bc} \right) = \, ?$ Source: BMA IIT Foundation Course

Which of the options is correct about the number $$\log _{ 4 }{ 18 }$$?

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